/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.persistence.entity.data.impl;

import static java.util.Collections.emptyList;

import java.util.List;
import java.util.Map;
import org.activiti.engine.history.HistoricProcessInstance;
import org.activiti.engine.impl.HistoricProcessInstanceQueryImpl;
import org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntity;
import org.activiti.engine.impl.persistence.entity.HistoricProcessInstanceEntityImpl;
import org.activiti.engine.impl.persistence.entity.data.AbstractDataManager;
import org.activiti.engine.impl.persistence.entity.data.HistoricProcessInstanceDataManager;

/**

 */
public class MybatisHistoricProcessInstanceDataManager
    extends AbstractDataManager<HistoricProcessInstanceEntity>
    implements HistoricProcessInstanceDataManager {

    public MybatisHistoricProcessInstanceDataManager(ProcessEngineConfigurationImpl processEngineConfiguration) {
        super(processEngineConfiguration);
    }

    @Override
    public Class<? extends HistoricProcessInstanceEntity> getManagedEntityClass() {
        return HistoricProcessInstanceEntityImpl.class;
    }

    @Override
    public HistoricProcessInstanceEntity create() {
        return new HistoricProcessInstanceEntityImpl();
    }

    @Override
    public HistoricProcessInstanceEntity create(ExecutionEntity processInstanceExecutionEntity) {
        return new HistoricProcessInstanceEntityImpl(processInstanceExecutionEntity);
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<String> findHistoricProcessInstanceIdsByProcessDefinitionId(String processDefinitionId) {
        return getDbSqlSession().selectList(
            "selectHistoricProcessInstanceIdsByProcessDefinitionId",
            processDefinitionId
        );
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<HistoricProcessInstanceEntity> findHistoricProcessInstancesBySuperProcessInstanceId(
        String superProcessInstanceId
    ) {
        return getDbSqlSession().selectList(
            "selectHistoricProcessInstanceIdsBySuperProcessInstanceId",
            superProcessInstanceId
        );
    }

    @Override
    public long findHistoricProcessInstanceCountByQueryCriteria(
        HistoricProcessInstanceQueryImpl historicProcessInstanceQuery
    ) {
        return (Long) getDbSqlSession().selectOne(
            "selectHistoricProcessInstanceCountByQueryCriteria",
            historicProcessInstanceQuery
        );
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<HistoricProcessInstance> findHistoricProcessInstancesByQueryCriteria(
        HistoricProcessInstanceQueryImpl historicProcessInstanceQuery
    ) {
        return getDbSqlSession().selectList(
            "selectHistoricProcessInstancesByQueryCriteria",
            historicProcessInstanceQuery
        );
    }

    @Override
    public List<HistoricProcessInstance> findHistoricProcessInstancesAndVariablesByQueryCriteria(
        HistoricProcessInstanceQueryImpl historicProcessInstanceQuery
    ) {
        // paging doesn't work for combining process instances and variables
        // due to an outer join, so doing it in-memory
        if (historicProcessInstanceQuery.getFirstResult() < 0 || historicProcessInstanceQuery.getMaxResults() <= 0) {
            return emptyList();
        }

        int firstResult = historicProcessInstanceQuery.getFirstResult();
        int maxResults = historicProcessInstanceQuery.getMaxResults();

        // setting max results, limit to 20000 results for performance reasons
        if (historicProcessInstanceQuery.getProcessInstanceVariablesLimit() != null) {
            historicProcessInstanceQuery.setMaxResults(historicProcessInstanceQuery.getProcessInstanceVariablesLimit());
        } else {
            historicProcessInstanceQuery.setMaxResults(
                getProcessEngineConfiguration().getHistoricProcessInstancesQueryLimit()
            );
        }
        historicProcessInstanceQuery.setFirstResult(0);

        List<HistoricProcessInstance> instanceList = getDbSqlSession().selectListWithRawParameterWithoutFilter(
            "selectHistoricProcessInstancesWithVariablesByQueryCriteria",
            historicProcessInstanceQuery,
            historicProcessInstanceQuery.getFirstResult(),
            historicProcessInstanceQuery.getMaxResults()
        );

        if (instanceList != null && !instanceList.isEmpty()) {
            if (firstResult > 0) {
                if (firstResult <= instanceList.size()) {
                    int toIndex = firstResult + Math.min(maxResults, instanceList.size() - firstResult);
                    return instanceList.subList(firstResult, toIndex);
                } else {
                    return emptyList();
                }
            } else {
                int toIndex = Math.min(maxResults, instanceList.size());
                return instanceList.subList(0, toIndex);
            }
        }

        return instanceList;
    }

    @Override
    @SuppressWarnings("unchecked")
    public List<HistoricProcessInstance> findHistoricProcessInstancesByNativeQuery(
        Map<String, Object> parameterMap,
        int firstResult,
        int maxResults
    ) {
        return getDbSqlSession().selectListWithRawParameter(
            "selectHistoricProcessInstanceByNativeQuery",
            parameterMap,
            firstResult,
            maxResults
        );
    }

    @Override
    public long findHistoricProcessInstanceCountByNativeQuery(Map<String, Object> parameterMap) {
        return (Long) getDbSqlSession().selectOne("selectHistoricProcessInstanceCountByNativeQuery", parameterMap);
    }
}
